SNS is about all I use...for mobile app push notifications. Sending 1 million notifications to iOS devices via Amazon SNS is blazing fast (takes just a few seconds). Trying to do the same thing directly using Apple's servers is surprisingly difficult. Firebase Cloud Messaging has "topics" that can do the same thing for Android, but FCM support for iOS was, the last time I checked, pretty limited. And before FCM topics were a thing, Amazon SNS was also the best way to rapidly push 1 million notifications to Android devices.
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SNS is about all I use...for mobile app push notifications. Sending 1 million notifications to iOS devices via Amazon SNS is blazing fast (takes just a few seconds). Trying to do the same thing directly using Apple's servers is surprisingly difficult. Firebase Cloud Messaging has "topics" that can do the same thing for Android, but FCM support for iOS was, the last time I checked, pretty limited. And before FCM topics were a thing, Amazon SNS was also the best way to rapidly push 1 million notifications to Android devices.